Tehran slams US visa waiver changes, threatens to retaliate

The speaker of Iran's Parliament on Sunday denounced recent changes to the US visa waiver program that require citizens of nearly 40 countries to get visas if they have visited Iran since 2011 or have Iranian nationality as well.    
Ali Larijiani told members of parliament that "Recently some US representatives have put some plans together which can only be referred to as harassment. If they don't amend it, there will be reciprocation from the Iranian side." He did not elaborate.
Citizens of 38 countries, including Britain, France, Germany, Spain, Italy and Japan, now need visas to travel to the US if they have visited Syria, Iran, Sudan or Iraq since 2011, or are dual nationals of one of the four countries. President Obama signed the bill into law in December.